Example:
After some hours of working overtime, you get to your friends on a party. They already had several drinks and thanks to their blood alcohol level, they're having a lot of fun, while you're still sober and therefore not in the same mood as them. To change that, you've got to level your own blood alcohol concentration up.

If people eventually stare at you because you drink a lot in a very short amount of time, you are allowed to excuse this by saying: "It's alright. I'm just leveling up right now."